Pages

Saturday, January 19, 2013

New Blue Impact Crater on Mercury

In the lower left portion of today's image is a small, young, rayed impact crater. The rays have a typical bluish cast in this color presentation. The relatively blue color in this case is caused partly by the extreme youth of the rays (surfaces exposed to the space environment of Mercury for long periods tend to "redden" and darken). In addition, the crater formed in a dark, bluish terrain called the "Low Reflectance Material." The tan area toward the top of the image is "intermediate terrain."